userspace/libc: implement sigaction(), sigemptyset(), signal() & strcspn()

Signed-off-by: EnderIce2 <enderice2@protonmail.com>

Userspace/libc/include/signal.h

@@ -197,14 +197,14 @@ extern "C"
 	int pthread_sigmask(int, const sigset_t *restrict, sigset_t *restrict);
 	int raise(int);
 	int sig2str(int, char *);
-	int sigaction(int, const struct sigaction *restrict, struct sigaction *restrict);
+	int sigaction(int sig, const struct sigaction *restrict act, struct sigaction *restrict oact);
 	int sigaddset(sigset_t *, int);
 	int sigaltstack(const stack_t *restrict, stack_t *restrict);
 	int sigdelset(sigset_t *, int);
-	int sigemptyset(sigset_t *);
+	int sigemptyset(sigset_t *set);
 	int sigfillset(sigset_t *);
 	int sigismember(const sigset_t *, int);
-	void (*signal(int, void (*)(int)))(int);
+	void (*signal(int sig, void (*func)(int)))(int);
 	int sigpending(sigset_t *);
 	int sigprocmask(int, const sigset_t *restrict, sigset_t *restrict);
 	int sigqueue(pid_t, int, union sigval);

Userspace/libc/include/string.h

@@ -41,7 +41,7 @@ extern "C"
 	int strcoll(const char *, const char *);
 	int strcoll_l(const char *, const char *, locale_t);
 	char *strcpy(char *restrict, const char *restrict);
-	size_t strcspn(const char *, const char *);
+	size_t strcspn(const char *s1, const char *s2);
 	char *strdup(const char *);
 	char *strerror(int);
 	char *strerror_l(int, locale_t);

Userspace/libc/src/std/signal.c

@@ -16,6 +16,8 @@
 */
 
 #include <signal.h>
+#include <errno.h>
+#include <stdio.h>
 
 export int kill(pid_t pid, int sig)
 {
@@ -29,14 +31,65 @@ export int pthread_kill(pthread_t, int);
 export int pthread_sigmask(int, const sigset_t *restrict, sigset_t *restrict);
 export int raise(int);
 export int sig2str(int, char *);
-export int sigaction(int, const struct sigaction *restrict, struct sigaction *restrict);
+
+export int sigaction(int sig, const struct sigaction *restrict act, struct sigaction *restrict oact)
+{
+	if (sig == SIGKILL || sig == SIGSTOP)
+	{
+		errno = EINVAL;
+		return -1;
+	}
+
+	if (oact != NULL)
+	{
+		printf("sigaction() is unimplemented\n");
+		// if (syscall3(SYS_RT_SIGACTION, sig, NULL, oact, sizeof(sigset_t)) < 0)
+		return -1;
+	}
+
+	if (act != NULL)
+	{
+		printf("sigaction() is unimplemented\n");
+		// if (syscall3(SYS_RT_SIGACTION, sig, act, NULL, sizeof(sigset_t)) < 0)
+		return -1;
+	}
+
+	return 0;
+}
+
 export int sigaddset(sigset_t *, int);
 export int sigaltstack(const stack_t *restrict, stack_t *restrict);
 export int sigdelset(sigset_t *, int);
-export int sigemptyset(sigset_t *);
+
+export int sigemptyset(sigset_t *set)
+{
+	if (set == NULL)
+	{
+		errno = EINVAL;
+		return -1;
+	}
+
+	*set = 0;
+	return 0;
+}
+
 export int sigfillset(sigset_t *);
 export int sigismember(const sigset_t *, int);
-export void (*signal(int, void (*)(int)))(int);
+
+export void (*signal(int sig, void (*func)(int)))(int)
+{
+	struct sigaction act, oact;
+
+	act.sa_handler = func;
+	sigemptyset(&act.sa_mask);
+	act.sa_flags = 0;
+
+	if (sigaction(sig, &act, &oact) < 0)
+		return SIG_ERR;
+
+	return oact.sa_handler;
+}
+
 export int sigpending(sigset_t *);
 export int sigprocmask(int, const sigset_t *restrict, sigset_t *restrict);
 export int sigqueue(pid_t, int, union sigval);

Userspace/libc/src/std/string.c

@@ -75,7 +75,24 @@ export int strcmp(const char *s1, const char *s2)
 export int strcoll(const char *, const char *);
 export int strcoll_l(const char *, const char *, locale_t);
 export char *strcpy(char *restrict, const char *restrict);
-export size_t strcspn(const char *, const char *);
+
+export size_t strcspn(const char *s1, const char *s2)
+{
+	const char *p = s1;
+	const char *spanp;
+	char c, sc;
+
+	while ((c = *p++) != 0)
+	{
+		for (spanp = s2; (sc = *spanp++) != 0;)
+		{
+			if (sc == c)
+				return p - 1 - s1;
+		}
+	}
+	return p - 1 - s1;
+}
+
 export char *strdup(const char *);
 export char *strerror(int);
 export char *strerror_l(int, locale_t);